staging: comedi: hwdrv_apci1500: introduce z8536_write()
The Z8536 CIO registers are indirectly written by writing the register offset to the control register then writing the value to the control register. Introduce a helper function to write the Z8536 CIO registers. The registers are written from "normal" code and in the interrupt handler, spinlock the sequence to protect the indirect register access. Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com> Reviewed-by: Ian Abbott <abbotti@mev.co.uk> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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